John b



(No Model.) 8

J. E. SPENCER.

AUTOMATIC DAMPER REGULATOR. No. 338,686. PatentedMar. 28, 1886.

UNITED STATES PATENT EEic JOHN E. SPENCER, OF SALEM, MASSACHUSETTS,ASSIGNOR OF ONE-HALF TO SMITH & SMART, OF SAME PLACE.

AUTO MATIC DAM PER-REGULATO R.

SPECIFICATION forming part of Letters Patent No. 338,686, dated March23, 1886.

Application filed December 26, 1885. Serial No. 186,722. (No model.)

2" all whom it may concern:

Be it known that 1, JOHN E. SPENCER, a citizen of the UnitedStates,residing at Salem, in the county of Essex and State ofMassachusetts, have invented certain new and useful Improvements inAutomatic Damper-Regulators; and I do hereby declare that the same arefully described in the following specificawtedin the accompanying draw-;b ings. This invention relates to improvements in automaticdamper-regulators for automatically regulating the damper within theflue or smoke-stack leading from a steam-generator, 1 according tovariations in the steam-pressure in the latter, so as to retain as nearas possible a uniform or normal pressure therein.

United States Letters Patent No. 327,337 were duly issued to meSeptember 29, 1885, for

2Q improvements in automatic damper-regulators, and in said patent Iemploy a stationary cylinder having its movable piston connected to thedamper or its connections, and a valve,

the stem of which is connected directly to the 2 weighted lever of thesteam-pressure device; but I have found that in practice such directconnection of the valve and lever causes the damper to close fullyin onecontinuous motion as soon as the piston in the regulator-cylinder bcommences to move, and to open in the same continuous motion when thepiston commences to movein the opposite direction. In damperregulatorsof this class it is very essential that the damper should be graduallyclosed, or

3 5 partly so, in proportion to the increase of pressure in thesteam-generator, and that it should likewise be gradually opened, orpartly so, as the pressure decreases, and such movements of the dampershould be steady and 0 gradual; and for this purpose I arrange in mypresent invention, between the regulator and the main lever of thepressure device, an intermediate or secondary lever,.the outer end ofwhich is suitably connected to the pressuredevice lever, and the innerend of such intermediate lever being preferably hung on a fulcrumattached to the movable piston, and having connected to it, between itsends, one end of the valve-stem. As a modification of my invention, thesaid intermediate lever may be hung on a stationary fulcrum, its outerend connected to the main lever of the pressure device and its inner endconnected to the valvestem of the regulator-valve, as will hereinafterbe more fully shown and described, reference being had to theaccompanying drawings, where Figure 1 represents a perspective view ofthe invention, showing in section the regulator-cylinder, its piston andvalve. Fig. 2 rep- 6o resents the modification of the invention.

Similar letters refer to similar parts wherever they occur on thedifferent parts of the drawings.

A is a suitable pressure device, having 6 3 within it a diaphragm orother movable or yielding part, on which the steam from the boiler isacting, as usual. to is the pipe leading from the boiler to the underside of the pressure device A, in the usual manner.

B is the pressure-lever, as usual, hinged or pivoted at b to thepressure device A, and resting upon the spindle a, extending from thediaphragm in the pressure device A,in the same manner as shown anddescribed in my 7 patent aforesaid.

B is the adjustable weight on lever B, as usual, such weight beingprovided with a setscrew or suitable fastening device, by meansv ofwhich it can be secured to lever B, after it has been adjusted thereonaccording to the pressure desired in the generator.

0 is a stand or guide for the lever B, such guide being provided withsuitable set-screws, as usual, to limit the swinging motion of said 8lever B.

ends of which are secured or made in one 5 piece, respectively, thehollow piston-rods e and e", that pass through stuffing-boxes at theupper and lower ends of the cylinder E, and v 2.1121 closed in theirextreme upper and lower en s.

e is a pipe leading fromthe lower end of piston-rod e, serving as anoutlet for the exhaust from the regulatorcylinder, and e is theinlet-pipe, as usual, to the cylinder E, leading from thesteam-generator or any other suitable source of pressure.

F is the flue or chimney leading from the boiler, and having locatedwithin it the oscillating damper f, the axis of which is provided withcrank f, to which is hinged the connecting-rodf, the lower end of whichis hinged to lever f', as shown in Fig. 1. The rear end of leverf ishinged to the stationary fulcrum and between it and the rod f the leverfis hinged to the lower end of the piston-rod 6. According tocircumstances and localities, other suitable and equivalent connectingmechanism may be employed between the end of piston-rod e and the damperf.

So far as described, the invention is constructed in the same manner asshown and described in my above-mentioned patent.

To the upper end of the piston-rod e is secured the arm or bracket 9,having fulcrumpin 9, to which is hinged the inner end of theintermediate lever, G, as shown in Fig. 1, the outer end of such leverbeing coupled to the outer end of the main pressure-lever B by means ofpin B, secured to lever B, and passing through a perforation in theouter end of lever G, or vice versa, or in any other suitable manner; orthe end of one lever may be made to rest on the end of the other, or ona projection thereon, without departing from the essence of myinvention.

G is an adjustable weight located on the intermediate lever, G,which, inconnection with the weight B on lever B, serves to regulate the desiredpressure on the pressure device A, which is the one to be kept normal inthe boiler.

H is the valve arranged within the piston e, as usual, and provided withthe valve-stem h, passing through a stuffing-box at the upper end of thehollow piston-rod e, and hinged or otherwise connected in its upper endto the intermediate lever, G, as shown in Fig. 1.

1n the modification shown in Fig. 2 the lever G is connected to lever Band to valve-stem h, as in Fig. l; but instead of being hung on amovable fulcrum on the piston-rod c it is hung on a stationary fulcrum,z, located between the outer end of said intermediate lever, G, and theregulator-cylinder E, such fulcrum being preferably made in the upperend of a standard, I, secured to bracket D, or in any other stationarypart of the device.

The operation of my invention is as follows: The regulator is set sothat the damper f will be half open, or nearly so, at the pressuredesired. Should the pressure in the steam-generator increase ordiminish,-the main lever B on the pressure device will gradually rise orfall, carrying the intermediate lever, G, with it, which operates thevalve of the automatic regulator, causing the damper f to close or opengradually as the pressure rises or falls. For example, should I desireto carry a pressure of, say, seventy pounds to the square inch in thesteam-generator, the weight B on the main lever B of the pressure devicewill be adjusted accordingly, to balance said pressure, or nearly so.Then by means of the weight G on the intermediate lever, G, I adjust itso that the damper f will commence to close at a pressure slightly undersaid pressure, gradually closing as the pressure increases, arriving athalf-closed, or nearly so, at seventy pounds pressure, thereby reducingthe draft gradually, and consequently the heat in the furnace, which hasa tendency to prevent the pressure from rising above the desiredpressure. Shouldthepressure continue to rise above seventy pounds, thedamper will continue to close gradually until, at a pressure slightlyabove seventy pounds,it will have fully closed. As the pressuregradually descends, the damper will gradually open, arriving athalfopen, or nearly so, at seventy pounds pressure. Should the pressurestill continue to fall below seventy pounds, the damper will continue toopen, arriving at full-open, or nearly so, at a pressure slightly belowseventy pounds. It will be plainly seen that a regulator operating adamper in this manner will hold the damper open just enough to keep thepressure normal, or nearly so, in the steam-generator.

It must be kept in mind that the normal condition of the automaticdamper-regulator is to hold the damper half open, or nearly so, at thedesired pressure, closing as the pressure increases and opening as thepressure decreases in the steam-generator.

By the employment of the said intermediate lever, G, it will be seenthat I relieve the main lever B of the pressure device of most of itsfrictional resistance, and that such frictional resistance is reduced inproportion to the length of such lever G.

What I wish to secure by Letters Patent, and claim, is

1. In an automatic damper-regulator, the intermediate lever, G,connected to the pressure-lever B and to the valve-stem h of theregulator-cylinder E, as and for the purpose set forth.

2. In an automatic damper regulator, a pressure device with its lever Bconnected to the intermediate lever, G, the latter being suspended uponthe movable piston-rod e and connected to the valve-rod h, as and forthe purpose set forth.

3. In an automatic damper-regulator, a pressure device and an adjustabledamper, combined with a regulator having one end of its piston connectedto the damper, the other end of said piston jointed to the intermediatelever, G, the latter being connected to the main lever B of the pressuredevice and to the valve of the regulator as and for In testimony whereofI have affixed my sigthe purpose set forth. nature in presence of twowitnesses.

4. In an automatic damper-regulator the intermediate lever, G, connectedto the press JOHN SPENCER 5 lire-lever B and to the piston-rod e andvalve- \Vitnesses:

stein h of the regulator-cylinder E, as and for ALBAN ANDREN, thepurpose set forth. FRED. O. CONVERSE.

